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International Terrestrial Reference Frame (ITRF)<br />
In the Surveying terminology, a reference frame is a set<br />
of points with their coordinates which realize an ideal<br />
reference system<br />
The International Earth Rotation Service (IERS) mission<br />
is<br />
to<br />
provide<br />
internationally<br />
accepted<br />
terrestrial<br />
reference systems<br />
ITRF is produced by IERS<br />
The ITRF is realized through the global Cartesian coordinates<br />
and linear velocities of a global set of sites equipped with<br />
various space geodetic observing systems.<br />
The space geodetic techniques used at present are LLR, SLR,<br />
VLBI, GPS, and DORIS (Doppler Orbitography and Radio-<br />
positioning Integrated by Satellite, is a French precision<br />
navigation system)<br />
2/15/2012 17
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